Hi,

I create helix via VB.NET using API without any problem.

I can even select the Helix with below code.

status = swModel.Extension.SelectByID2("Helix/Spiral1", "REFERENCECURVES", 0, 0, 0, True, 0, Nothing, 0)

Well, But I can not get the length of helix via API VB.NET. 

Regards,

Mucip:)